public class Application
  int x;
  int y;
  Pointer()
  {
    SetXY(0,0);
  }
  Pointer(int a,int b) 
  {
    SetXY(a,b);
  }
  public int GetX()
  {
    return x;
  }
  public int GetY()
  {
    return y;
  }
  public void Show()
  {
    if(this instanceof Circle)
      System.out.println("zhongxin: " + "("+x+","+y+")");
    else
      System.out.println("dian:" + "("+x+","+y+")");
  }
  public Show()
    System.out.println("dian de zuo biao wei :" (x,y))
  
